Starting System - Diagnostic Procedures: Notes

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Verify the customer concern by operating the system.

Visually inspect for obvious signs of mechanical and electrical damage.

Visual Inspection Chart

Mechanical	Electrical
Starter Motor. Battery.	Fuse 27 (30A) Front power distribution box Fuse 1 (5A) Primary junction box Starter relay. Fuse 15 (5A) Primary junction box Transmission control module (TCM) Engine control module (ECM) Wiring harness(es). Damaged, loose or corroded connectors

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
If the concern is not visually evident, verify the symptom and refer to Symptom Chart .

Symptom Chart

Condition	Possible Source	Action
The engine does not crank	Battery Starter motor Starter relay Ignition switch Transmission control module (TCM) ECM	GO to Pinpoint Test A
Engine cranks slowly	Battery Circuitry Starter motor	GO to Pinpoint Test B
Unusual starter motor noise	Starter motor Flywheel ring gear	CHECK flywheel or flexplate. For additional information, refer to Engine System - General Information article. INSPECT starter motor for alignment, cracked case. Make sure the mounting bolts are tightened. If necessary, INSTALL a new starter motor.
The starter spins but the engine does not crank	Starter motor	INSPECT the flywheel or flexplate for missing teeth. CHECK starter motor for correct mounting. If concern persists, INSTALL a new starter motor.